A power device includes a power factor corrector, an auxiliary capacitor, a switching device, an auxiliary boost circuit, a controller and a voltage conversion device. The switching device has a first end electrically connected to the output end of the power factor corrector, and a second end electrically connected to one end of the auxiliary capacitor. An output end of the auxiliary boost circuit is electrically connected to the output end of the power factor corrector, an input end of the auxiliary boost circuit is electrically connected to a middle end of the switching device, and a ground end of the auxiliary boost circuit is electrically connected to another end of the auxiliary capacitor. The controller is electrically connected to the switching device and the auxiliary boost circuit. The input end of the voltage conversion device is electrically connected to the output end of the power factor corrector.
Legal claims defining the scope of protection, as filed with the USPTO.
4. The power device of claim 3, wherein the controller turns on the first semiconductor switch and turns off the second semiconductor switch in response to that the power factor corrector operates, and the auxiliary switch is in a blocking state.
5. The power device of claim 4, wherein the power factor corrector is electrically connected to an input power source, the auxiliary switch maintains the blocking state in response to that the power factor corrector stops operating for not exceeding a preset time period after the input power source is powered off.
6. The power device of claim 4, wherein the controller turns off the first semiconductor switch, turns on the second semiconductor switch, and controls the auxiliary switch to be turned on and turned off alternately in response to that the power factor corrector stops operating for exceeding the preset time period.
12. The operation method of claim 11, wherein the auxiliary boost circuit includes an auxiliary diode, an auxiliary switch and an auxiliary inductor, a cathode of the auxiliary diode is electrically connected to the output end of the power factor corrector, one end of the auxiliary switch is electrically connected to an anode of the auxiliary diode, another end of the auxiliary switch is electrically connected to a ground end, and one end of the auxiliary inductor is electrically connected to the one end of the auxiliary switch.
13. The operation method of claim 12, wherein the switching device includes a first semiconductor switch and a second semiconductor switch, one end of the first semiconductor switch is electrically connected to the output end of the power factor corrector, another end of the first semiconductor switch is electrically connected to another end of the auxiliary inductor, one end of the second semiconductor switch is electrically connected to the another end of the first semiconductor switch, another end of the second semiconductor switch is electrically connected to the one end of the auxiliary capacitor, the first semiconductor switch has a first body diode, a cathode and an anode of the first body diode are electrically connected to the one end and the another end of the first semiconductor switch respectively, the second semiconductor switch has a second body diode, and an anode and a cathode of the second body diode are electrically connected to the one end and the another end of the second semiconductor switch respectively.
17. The operation method of claim 11, wherein the power device comprises a second inductor inductively coupled to a first inductor of the power factor corrector, the second inductor is electrically connected to a voltage multiplier, so that the voltage multiplier provides an auxiliary power for the switching device through an inductive coupling of the first and second inductors.
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August 8, 2021
January 3, 2023
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